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From a low-carbon economy perspective, this paper discusses the significance and prospects of the development and integrated use of smart grid and the new energy. It proposes that, for China to develop a smart grid, an overall view should be adopted to enhance the cooperation between the petroleum, the coal, the electricity and other energy industries, raising the proportion of new energy in the whole energy mix and addressing the distributed power generation issue through developing a smart grid, so that an optimal use of smart grid can be achieved, which will ultimately save the energy and reduce emissions for the whole nation. The authors of this paper hold that in today's China, the integrated use of smart grid and new energy should become the mainstream of energy development and one of the best solutions to energy-saving and emissions reduction in the future. In current China, as the electric power industry is the major consumer of the total primary energy and the situation will last for a considerable length of time, the integrated utilization of the smart grid and new energy sources that is in accordance with China's reality can optimize the energy source mix and conduce to the development of a low-carbon power industry. It is a practical way to cut down carbon emissions and shall bring long-term economic and social benefits.